Here in Britian it's hot with a captial H. We have spring weather that is warmer than Ibiza and it has reminded me of this awesome and simple photography tip.
When shooting events or anything outdoors in the sun, you should be wearing sunscreen. Especially if you burn so easily like myself. But applying sunscreen tends to leave oily hands which won't dissapear even when we wipe our hands on our jeans. Try applying the sun cream to the back of your hand then to your face without using your palms.
It may feel strange and awkward at first, but you'll soon get used to it. And more importantly, no more oily palms.